| Answer | Crossword Clue |
|---|---|
| METHANE | Marsh gas constituent |
| ETHANE | Natural gas constituent |
| METHANE | Natural gas constituent |
| ETHANE | Constituent of natural gas |
| ETHANE | Constituent of natural gas. |
| METHANE | Marsh gas |
| MIASMA | Marsh gas |
| METHANE | Marsh gas. |
| METHANE | Marsh gas, mostly |
| METHANE | Marsh gas, essentially |
| spunkie | a light caused by the combustion of marsh gas |
| spunkies | SPUNKIE, a light caused by the combustion of marsh gas |
